Loading...
Note: File does not exist in v6.13.7.
1/*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19#include <linux/cpu.h>
20#include <linux/cpu_pm.h>
21#include <linux/errno.h>
22#include <linux/err.h>
23#include <linux/kvm_host.h>
24#include <linux/module.h>
25#include <linux/vmalloc.h>
26#include <linux/fs.h>
27#include <linux/mman.h>
28#include <linux/sched.h>
29#include <linux/kvm.h>
30#include <trace/events/kvm.h>
31
32#define CREATE_TRACE_POINTS
33#include "trace.h"
34
35#include <asm/uaccess.h>
36#include <asm/ptrace.h>
37#include <asm/mman.h>
38#include <asm/tlbflush.h>
39#include <asm/cacheflush.h>
40#include <asm/virt.h>
41#include <asm/kvm_arm.h>
42#include <asm/kvm_asm.h>
43#include <asm/kvm_mmu.h>
44#include <asm/kvm_emulate.h>
45#include <asm/kvm_coproc.h>
46#include <asm/kvm_psci.h>
47
48#ifdef REQUIRES_VIRT
49__asm__(".arch_extension virt");
50#endif
51
52static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
53static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
54static unsigned long hyp_default_vectors;
55
56/* Per-CPU variable containing the currently running vcpu. */
57static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
58
59/* The VMID used in the VTTBR */
60static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
61static u8 kvm_next_vmid;
62static DEFINE_SPINLOCK(kvm_vmid_lock);
63
64static bool vgic_present;
65
66static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
67{
68 BUG_ON(preemptible());
69 __this_cpu_write(kvm_arm_running_vcpu, vcpu);
70}
71
72/**
73 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
74 * Must be called from non-preemptible context
75 */
76struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
77{
78 BUG_ON(preemptible());
79 return __this_cpu_read(kvm_arm_running_vcpu);
80}
81
82/**
83 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
84 */
85struct kvm_vcpu __percpu **kvm_get_running_vcpus(void)
86{
87 return &kvm_arm_running_vcpu;
88}
89
90int kvm_arch_hardware_enable(void *garbage)
91{
92 return 0;
93}
94
95int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
96{
97 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
98}
99
100void kvm_arch_hardware_disable(void *garbage)
101{
102}
103
104int kvm_arch_hardware_setup(void)
105{
106 return 0;
107}
108
109void kvm_arch_hardware_unsetup(void)
110{
111}
112
113void kvm_arch_check_processor_compat(void *rtn)
114{
115 *(int *)rtn = 0;
116}
117
118void kvm_arch_sync_events(struct kvm *kvm)
119{
120}
121
122/**
123 * kvm_arch_init_vm - initializes a VM data structure
124 * @kvm: pointer to the KVM struct
125 */
126int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
127{
128 int ret = 0;
129
130 if (type)
131 return -EINVAL;
132
133 ret = kvm_alloc_stage2_pgd(kvm);
134 if (ret)
135 goto out_fail_alloc;
136
137 ret = create_hyp_mappings(kvm, kvm + 1);
138 if (ret)
139 goto out_free_stage2_pgd;
140
141 kvm_timer_init(kvm);
142
143 /* Mark the initial VMID generation invalid */
144 kvm->arch.vmid_gen = 0;
145
146 return ret;
147out_free_stage2_pgd:
148 kvm_free_stage2_pgd(kvm);
149out_fail_alloc:
150 return ret;
151}
152
153int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
154{
155 return VM_FAULT_SIGBUS;
156}
157
158void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
159 struct kvm_memory_slot *dont)
160{
161}
162
163int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
164 unsigned long npages)
165{
166 return 0;
167}
168
169/**
170 * kvm_arch_destroy_vm - destroy the VM data structure
171 * @kvm: pointer to the KVM struct
172 */
173void kvm_arch_destroy_vm(struct kvm *kvm)
174{
175 int i;
176
177 kvm_free_stage2_pgd(kvm);
178
179 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
180 if (kvm->vcpus[i]) {
181 kvm_arch_vcpu_free(kvm->vcpus[i]);
182 kvm->vcpus[i] = NULL;
183 }
184 }
185}
186
187int kvm_dev_ioctl_check_extension(long ext)
188{
189 int r;
190 switch (ext) {
191 case KVM_CAP_IRQCHIP:
192 r = vgic_present;
193 break;
194 case KVM_CAP_DEVICE_CTRL:
195 case KVM_CAP_USER_MEMORY:
196 case KVM_CAP_SYNC_MMU:
197 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
198 case KVM_CAP_ONE_REG:
199 case KVM_CAP_ARM_PSCI:
200 r = 1;
201 break;
202 case KVM_CAP_COALESCED_MMIO:
203 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
204 break;
205 case KVM_CAP_ARM_SET_DEVICE_ADDR:
206 r = 1;
207 break;
208 case KVM_CAP_NR_VCPUS:
209 r = num_online_cpus();
210 break;
211 case KVM_CAP_MAX_VCPUS:
212 r = KVM_MAX_VCPUS;
213 break;
214 default:
215 r = kvm_arch_dev_ioctl_check_extension(ext);
216 break;
217 }
218 return r;
219}
220
221long kvm_arch_dev_ioctl(struct file *filp,
222 unsigned int ioctl, unsigned long arg)
223{
224 return -EINVAL;
225}
226
227void kvm_arch_memslots_updated(struct kvm *kvm)
228{
229}
230
231int kvm_arch_prepare_memory_region(struct kvm *kvm,
232 struct kvm_memory_slot *memslot,
233 struct kvm_userspace_memory_region *mem,
234 enum kvm_mr_change change)
235{
236 return 0;
237}
238
239void kvm_arch_commit_memory_region(struct kvm *kvm,
240 struct kvm_userspace_memory_region *mem,
241 const struct kvm_memory_slot *old,
242 enum kvm_mr_change change)
243{
244}
245
246void kvm_arch_flush_shadow_all(struct kvm *kvm)
247{
248}
249
250void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
251 struct kvm_memory_slot *slot)
252{
253}
254
255struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
256{
257 int err;
258 struct kvm_vcpu *vcpu;
259
260 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
261 if (!vcpu) {
262 err = -ENOMEM;
263 goto out;
264 }
265
266 err = kvm_vcpu_init(vcpu, kvm, id);
267 if (err)
268 goto free_vcpu;
269
270 err = create_hyp_mappings(vcpu, vcpu + 1);
271 if (err)
272 goto vcpu_uninit;
273
274 return vcpu;
275vcpu_uninit:
276 kvm_vcpu_uninit(vcpu);
277free_vcpu:
278 kmem_cache_free(kvm_vcpu_cache, vcpu);
279out:
280 return ERR_PTR(err);
281}
282
283int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
284{
285 return 0;
286}
287
288void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
289{
290 kvm_mmu_free_memory_caches(vcpu);
291 kvm_timer_vcpu_terminate(vcpu);
292 kmem_cache_free(kvm_vcpu_cache, vcpu);
293}
294
295void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
296{
297 kvm_arch_vcpu_free(vcpu);
298}
299
300int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
301{
302 return 0;
303}
304
305int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
306{
307 int ret;
308
309 /* Force users to call KVM_ARM_VCPU_INIT */
310 vcpu->arch.target = -1;
311
312 /* Set up VGIC */
313 ret = kvm_vgic_vcpu_init(vcpu);
314 if (ret)
315 return ret;
316
317 /* Set up the timer */
318 kvm_timer_vcpu_init(vcpu);
319
320 return 0;
321}
322
323void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
324{
325}
326
327void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
328{
329 vcpu->cpu = cpu;
330 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
331
332 /*
333 * Check whether this vcpu requires the cache to be flushed on
334 * this physical CPU. This is a consequence of doing dcache
335 * operations by set/way on this vcpu. We do it here to be in
336 * a non-preemptible section.
337 */
338 if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
339 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
340
341 kvm_arm_set_running_vcpu(vcpu);
342}
343
344void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
345{
346 /*
347 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
348 * if the vcpu is no longer assigned to a cpu. This is used for the
349 * optimized make_all_cpus_request path.
350 */
351 vcpu->cpu = -1;
352
353 kvm_arm_set_running_vcpu(NULL);
354}
355
356int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
357 struct kvm_guest_debug *dbg)
358{
359 return -EINVAL;
360}
361
362
363int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
364 struct kvm_mp_state *mp_state)
365{
366 return -EINVAL;
367}
368
369int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
370 struct kvm_mp_state *mp_state)
371{
372 return -EINVAL;
373}
374
375/**
376 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
377 * @v: The VCPU pointer
378 *
379 * If the guest CPU is not waiting for interrupts or an interrupt line is
380 * asserted, the CPU is by definition runnable.
381 */
382int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
383{
384 return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
385}
386
387/* Just ensure a guest exit from a particular CPU */
388static void exit_vm_noop(void *info)
389{
390}
391
392void force_vm_exit(const cpumask_t *mask)
393{
394 smp_call_function_many(mask, exit_vm_noop, NULL, true);
395}
396
397/**
398 * need_new_vmid_gen - check that the VMID is still valid
399 * @kvm: The VM's VMID to checkt
400 *
401 * return true if there is a new generation of VMIDs being used
402 *
403 * The hardware supports only 256 values with the value zero reserved for the
404 * host, so we check if an assigned value belongs to a previous generation,
405 * which which requires us to assign a new value. If we're the first to use a
406 * VMID for the new generation, we must flush necessary caches and TLBs on all
407 * CPUs.
408 */
409static bool need_new_vmid_gen(struct kvm *kvm)
410{
411 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
412}
413
414/**
415 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
416 * @kvm The guest that we are about to run
417 *
418 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
419 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
420 * caches and TLBs.
421 */
422static void update_vttbr(struct kvm *kvm)
423{
424 phys_addr_t pgd_phys;
425 u64 vmid;
426
427 if (!need_new_vmid_gen(kvm))
428 return;
429
430 spin_lock(&kvm_vmid_lock);
431
432 /*
433 * We need to re-check the vmid_gen here to ensure that if another vcpu
434 * already allocated a valid vmid for this vm, then this vcpu should
435 * use the same vmid.
436 */
437 if (!need_new_vmid_gen(kvm)) {
438 spin_unlock(&kvm_vmid_lock);
439 return;
440 }
441
442 /* First user of a new VMID generation? */
443 if (unlikely(kvm_next_vmid == 0)) {
444 atomic64_inc(&kvm_vmid_gen);
445 kvm_next_vmid = 1;
446
447 /*
448 * On SMP we know no other CPUs can use this CPU's or each
449 * other's VMID after force_vm_exit returns since the
450 * kvm_vmid_lock blocks them from reentry to the guest.
451 */
452 force_vm_exit(cpu_all_mask);
453 /*
454 * Now broadcast TLB + ICACHE invalidation over the inner
455 * shareable domain to make sure all data structures are
456 * clean.
457 */
458 kvm_call_hyp(__kvm_flush_vm_context);
459 }
460
461 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
462 kvm->arch.vmid = kvm_next_vmid;
463 kvm_next_vmid++;
464
465 /* update vttbr to be used with the new vmid */
466 pgd_phys = virt_to_phys(kvm->arch.pgd);
467 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
468 kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK;
469 kvm->arch.vttbr |= vmid;
470
471 spin_unlock(&kvm_vmid_lock);
472}
473
474static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
475{
476 int ret;
477
478 if (likely(vcpu->arch.has_run_once))
479 return 0;
480
481 vcpu->arch.has_run_once = true;
482
483 /*
484 * Initialize the VGIC before running a vcpu the first time on
485 * this VM.
486 */
487 if (unlikely(!vgic_initialized(vcpu->kvm))) {
488 ret = kvm_vgic_init(vcpu->kvm);
489 if (ret)
490 return ret;
491 }
492
493 return 0;
494}
495
496static void vcpu_pause(struct kvm_vcpu *vcpu)
497{
498 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
499
500 wait_event_interruptible(*wq, !vcpu->arch.pause);
501}
502
503static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
504{
505 return vcpu->arch.target >= 0;
506}
507
508/**
509 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
510 * @vcpu: The VCPU pointer
511 * @run: The kvm_run structure pointer used for userspace state exchange
512 *
513 * This function is called through the VCPU_RUN ioctl called from user space. It
514 * will execute VM code in a loop until the time slice for the process is used
515 * or some emulation is needed from user space in which case the function will
516 * return with return value 0 and with the kvm_run structure filled in with the
517 * required data for the requested emulation.
518 */
519int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
520{
521 int ret;
522 sigset_t sigsaved;
523
524 if (unlikely(!kvm_vcpu_initialized(vcpu)))
525 return -ENOEXEC;
526
527 ret = kvm_vcpu_first_run_init(vcpu);
528 if (ret)
529 return ret;
530
531 if (run->exit_reason == KVM_EXIT_MMIO) {
532 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
533 if (ret)
534 return ret;
535 }
536
537 if (vcpu->sigset_active)
538 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
539
540 ret = 1;
541 run->exit_reason = KVM_EXIT_UNKNOWN;
542 while (ret > 0) {
543 /*
544 * Check conditions before entering the guest
545 */
546 cond_resched();
547
548 update_vttbr(vcpu->kvm);
549
550 if (vcpu->arch.pause)
551 vcpu_pause(vcpu);
552
553 kvm_vgic_flush_hwstate(vcpu);
554 kvm_timer_flush_hwstate(vcpu);
555
556 local_irq_disable();
557
558 /*
559 * Re-check atomic conditions
560 */
561 if (signal_pending(current)) {
562 ret = -EINTR;
563 run->exit_reason = KVM_EXIT_INTR;
564 }
565
566 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
567 local_irq_enable();
568 kvm_timer_sync_hwstate(vcpu);
569 kvm_vgic_sync_hwstate(vcpu);
570 continue;
571 }
572
573 /**************************************************************
574 * Enter the guest
575 */
576 trace_kvm_entry(*vcpu_pc(vcpu));
577 kvm_guest_enter();
578 vcpu->mode = IN_GUEST_MODE;
579
580 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
581
582 vcpu->mode = OUTSIDE_GUEST_MODE;
583 vcpu->arch.last_pcpu = smp_processor_id();
584 kvm_guest_exit();
585 trace_kvm_exit(*vcpu_pc(vcpu));
586 /*
587 * We may have taken a host interrupt in HYP mode (ie
588 * while executing the guest). This interrupt is still
589 * pending, as we haven't serviced it yet!
590 *
591 * We're now back in SVC mode, with interrupts
592 * disabled. Enabling the interrupts now will have
593 * the effect of taking the interrupt again, in SVC
594 * mode this time.
595 */
596 local_irq_enable();
597
598 /*
599 * Back from guest
600 *************************************************************/
601
602 kvm_timer_sync_hwstate(vcpu);
603 kvm_vgic_sync_hwstate(vcpu);
604
605 ret = handle_exit(vcpu, run, ret);
606 }
607
608 if (vcpu->sigset_active)
609 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
610 return ret;
611}
612
613static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
614{
615 int bit_index;
616 bool set;
617 unsigned long *ptr;
618
619 if (number == KVM_ARM_IRQ_CPU_IRQ)
620 bit_index = __ffs(HCR_VI);
621 else /* KVM_ARM_IRQ_CPU_FIQ */
622 bit_index = __ffs(HCR_VF);
623
624 ptr = (unsigned long *)&vcpu->arch.irq_lines;
625 if (level)
626 set = test_and_set_bit(bit_index, ptr);
627 else
628 set = test_and_clear_bit(bit_index, ptr);
629
630 /*
631 * If we didn't change anything, no need to wake up or kick other CPUs
632 */
633 if (set == level)
634 return 0;
635
636 /*
637 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
638 * trigger a world-switch round on the running physical CPU to set the
639 * virtual IRQ/FIQ fields in the HCR appropriately.
640 */
641 kvm_vcpu_kick(vcpu);
642
643 return 0;
644}
645
646int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
647 bool line_status)
648{
649 u32 irq = irq_level->irq;
650 unsigned int irq_type, vcpu_idx, irq_num;
651 int nrcpus = atomic_read(&kvm->online_vcpus);
652 struct kvm_vcpu *vcpu = NULL;
653 bool level = irq_level->level;
654
655 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
656 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
657 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
658
659 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
660
661 switch (irq_type) {
662 case KVM_ARM_IRQ_TYPE_CPU:
663 if (irqchip_in_kernel(kvm))
664 return -ENXIO;
665
666 if (vcpu_idx >= nrcpus)
667 return -EINVAL;
668
669 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
670 if (!vcpu)
671 return -EINVAL;
672
673 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
674 return -EINVAL;
675
676 return vcpu_interrupt_line(vcpu, irq_num, level);
677 case KVM_ARM_IRQ_TYPE_PPI:
678 if (!irqchip_in_kernel(kvm))
679 return -ENXIO;
680
681 if (vcpu_idx >= nrcpus)
682 return -EINVAL;
683
684 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
685 if (!vcpu)
686 return -EINVAL;
687
688 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
689 return -EINVAL;
690
691 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
692 case KVM_ARM_IRQ_TYPE_SPI:
693 if (!irqchip_in_kernel(kvm))
694 return -ENXIO;
695
696 if (irq_num < VGIC_NR_PRIVATE_IRQS ||
697 irq_num > KVM_ARM_IRQ_GIC_MAX)
698 return -EINVAL;
699
700 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
701 }
702
703 return -EINVAL;
704}
705
706static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
707 struct kvm_vcpu_init *init)
708{
709 int ret;
710
711 ret = kvm_vcpu_set_target(vcpu, init);
712 if (ret)
713 return ret;
714
715 /*
716 * Handle the "start in power-off" case by marking the VCPU as paused.
717 */
718 if (__test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
719 vcpu->arch.pause = true;
720
721 return 0;
722}
723
724long kvm_arch_vcpu_ioctl(struct file *filp,
725 unsigned int ioctl, unsigned long arg)
726{
727 struct kvm_vcpu *vcpu = filp->private_data;
728 void __user *argp = (void __user *)arg;
729
730 switch (ioctl) {
731 case KVM_ARM_VCPU_INIT: {
732 struct kvm_vcpu_init init;
733
734 if (copy_from_user(&init, argp, sizeof(init)))
735 return -EFAULT;
736
737 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
738 }
739 case KVM_SET_ONE_REG:
740 case KVM_GET_ONE_REG: {
741 struct kvm_one_reg reg;
742
743 if (unlikely(!kvm_vcpu_initialized(vcpu)))
744 return -ENOEXEC;
745
746 if (copy_from_user(®, argp, sizeof(reg)))
747 return -EFAULT;
748 if (ioctl == KVM_SET_ONE_REG)
749 return kvm_arm_set_reg(vcpu, ®);
750 else
751 return kvm_arm_get_reg(vcpu, ®);
752 }
753 case KVM_GET_REG_LIST: {
754 struct kvm_reg_list __user *user_list = argp;
755 struct kvm_reg_list reg_list;
756 unsigned n;
757
758 if (unlikely(!kvm_vcpu_initialized(vcpu)))
759 return -ENOEXEC;
760
761 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
762 return -EFAULT;
763 n = reg_list.n;
764 reg_list.n = kvm_arm_num_regs(vcpu);
765 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
766 return -EFAULT;
767 if (n < reg_list.n)
768 return -E2BIG;
769 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
770 }
771 default:
772 return -EINVAL;
773 }
774}
775
776int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
777{
778 return -EINVAL;
779}
780
781static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
782 struct kvm_arm_device_addr *dev_addr)
783{
784 unsigned long dev_id, type;
785
786 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
787 KVM_ARM_DEVICE_ID_SHIFT;
788 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
789 KVM_ARM_DEVICE_TYPE_SHIFT;
790
791 switch (dev_id) {
792 case KVM_ARM_DEVICE_VGIC_V2:
793 if (!vgic_present)
794 return -ENXIO;
795 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
796 default:
797 return -ENODEV;
798 }
799}
800
801long kvm_arch_vm_ioctl(struct file *filp,
802 unsigned int ioctl, unsigned long arg)
803{
804 struct kvm *kvm = filp->private_data;
805 void __user *argp = (void __user *)arg;
806
807 switch (ioctl) {
808 case KVM_CREATE_IRQCHIP: {
809 if (vgic_present)
810 return kvm_vgic_create(kvm);
811 else
812 return -ENXIO;
813 }
814 case KVM_ARM_SET_DEVICE_ADDR: {
815 struct kvm_arm_device_addr dev_addr;
816
817 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
818 return -EFAULT;
819 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
820 }
821 case KVM_ARM_PREFERRED_TARGET: {
822 int err;
823 struct kvm_vcpu_init init;
824
825 err = kvm_vcpu_preferred_target(&init);
826 if (err)
827 return err;
828
829 if (copy_to_user(argp, &init, sizeof(init)))
830 return -EFAULT;
831
832 return 0;
833 }
834 default:
835 return -EINVAL;
836 }
837}
838
839static void cpu_init_hyp_mode(void *dummy)
840{
841 phys_addr_t boot_pgd_ptr;
842 phys_addr_t pgd_ptr;
843 unsigned long hyp_stack_ptr;
844 unsigned long stack_page;
845 unsigned long vector_ptr;
846
847 /* Switch from the HYP stub to our own HYP init vector */
848 __hyp_set_vectors(kvm_get_idmap_vector());
849
850 boot_pgd_ptr = kvm_mmu_get_boot_httbr();
851 pgd_ptr = kvm_mmu_get_httbr();
852 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
853 hyp_stack_ptr = stack_page + PAGE_SIZE;
854 vector_ptr = (unsigned long)__kvm_hyp_vector;
855
856 __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
857}
858
859static int hyp_init_cpu_notify(struct notifier_block *self,
860 unsigned long action, void *cpu)
861{
862 switch (action) {
863 case CPU_STARTING:
864 case CPU_STARTING_FROZEN:
865 cpu_init_hyp_mode(NULL);
866 break;
867 }
868
869 return NOTIFY_OK;
870}
871
872static struct notifier_block hyp_init_cpu_nb = {
873 .notifier_call = hyp_init_cpu_notify,
874};
875
876#ifdef CONFIG_CPU_PM
877static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
878 unsigned long cmd,
879 void *v)
880{
881 if (cmd == CPU_PM_EXIT &&
882 __hyp_get_vectors() == hyp_default_vectors) {
883 cpu_init_hyp_mode(NULL);
884 return NOTIFY_OK;
885 }
886
887 return NOTIFY_DONE;
888}
889
890static struct notifier_block hyp_init_cpu_pm_nb = {
891 .notifier_call = hyp_init_cpu_pm_notifier,
892};
893
894static void __init hyp_cpu_pm_init(void)
895{
896 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
897}
898#else
899static inline void hyp_cpu_pm_init(void)
900{
901}
902#endif
903
904/**
905 * Inits Hyp-mode on all online CPUs
906 */
907static int init_hyp_mode(void)
908{
909 int cpu;
910 int err = 0;
911
912 /*
913 * Allocate Hyp PGD and setup Hyp identity mapping
914 */
915 err = kvm_mmu_init();
916 if (err)
917 goto out_err;
918
919 /*
920 * It is probably enough to obtain the default on one
921 * CPU. It's unlikely to be different on the others.
922 */
923 hyp_default_vectors = __hyp_get_vectors();
924
925 /*
926 * Allocate stack pages for Hypervisor-mode
927 */
928 for_each_possible_cpu(cpu) {
929 unsigned long stack_page;
930
931 stack_page = __get_free_page(GFP_KERNEL);
932 if (!stack_page) {
933 err = -ENOMEM;
934 goto out_free_stack_pages;
935 }
936
937 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
938 }
939
940 /*
941 * Map the Hyp-code called directly from the host
942 */
943 err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
944 if (err) {
945 kvm_err("Cannot map world-switch code\n");
946 goto out_free_mappings;
947 }
948
949 /*
950 * Map the Hyp stack pages
951 */
952 for_each_possible_cpu(cpu) {
953 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
954 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
955
956 if (err) {
957 kvm_err("Cannot map hyp stack\n");
958 goto out_free_mappings;
959 }
960 }
961
962 /*
963 * Map the host CPU structures
964 */
965 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
966 if (!kvm_host_cpu_state) {
967 err = -ENOMEM;
968 kvm_err("Cannot allocate host CPU state\n");
969 goto out_free_mappings;
970 }
971
972 for_each_possible_cpu(cpu) {
973 kvm_cpu_context_t *cpu_ctxt;
974
975 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
976 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
977
978 if (err) {
979 kvm_err("Cannot map host CPU state: %d\n", err);
980 goto out_free_context;
981 }
982 }
983
984 /*
985 * Execute the init code on each CPU.
986 */
987 on_each_cpu(cpu_init_hyp_mode, NULL, 1);
988
989 /*
990 * Init HYP view of VGIC
991 */
992 err = kvm_vgic_hyp_init();
993 if (err)
994 goto out_free_context;
995
996#ifdef CONFIG_KVM_ARM_VGIC
997 vgic_present = true;
998#endif
999
1000 /*
1001 * Init HYP architected timer support
1002 */
1003 err = kvm_timer_hyp_init();
1004 if (err)
1005 goto out_free_mappings;
1006
1007#ifndef CONFIG_HOTPLUG_CPU
1008 free_boot_hyp_pgd();
1009#endif
1010
1011 kvm_perf_init();
1012
1013 kvm_info("Hyp mode initialized successfully\n");
1014
1015 return 0;
1016out_free_context:
1017 free_percpu(kvm_host_cpu_state);
1018out_free_mappings:
1019 free_hyp_pgds();
1020out_free_stack_pages:
1021 for_each_possible_cpu(cpu)
1022 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1023out_err:
1024 kvm_err("error initializing Hyp mode: %d\n", err);
1025 return err;
1026}
1027
1028static void check_kvm_target_cpu(void *ret)
1029{
1030 *(int *)ret = kvm_target_cpu();
1031}
1032
1033/**
1034 * Initialize Hyp-mode and memory mappings on all CPUs.
1035 */
1036int kvm_arch_init(void *opaque)
1037{
1038 int err;
1039 int ret, cpu;
1040
1041 if (!is_hyp_mode_available()) {
1042 kvm_err("HYP mode not available\n");
1043 return -ENODEV;
1044 }
1045
1046 for_each_online_cpu(cpu) {
1047 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1048 if (ret < 0) {
1049 kvm_err("Error, CPU %d not supported!\n", cpu);
1050 return -ENODEV;
1051 }
1052 }
1053
1054 cpu_notifier_register_begin();
1055
1056 err = init_hyp_mode();
1057 if (err)
1058 goto out_err;
1059
1060 err = __register_cpu_notifier(&hyp_init_cpu_nb);
1061 if (err) {
1062 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
1063 goto out_err;
1064 }
1065
1066 cpu_notifier_register_done();
1067
1068 hyp_cpu_pm_init();
1069
1070 kvm_coproc_table_init();
1071 return 0;
1072out_err:
1073 cpu_notifier_register_done();
1074 return err;
1075}
1076
1077/* NOP: Compiling as a module not supported */
1078void kvm_arch_exit(void)
1079{
1080 kvm_perf_teardown();
1081}
1082
1083static int arm_init(void)
1084{
1085 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1086 return rc;
1087}
1088
1089module_init(arm_init);